Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in C:\xampp\htdocs\r10csm\vendor\nunomaduro\collision\tests\Unit\HandlerTest.php:12 Stack trace: #0 {main} thrown in C:\xampp\htdocs\r10csm\vendor\nunomaduro\collision\tests\Unit\HandlerTest.php on line 12